Nuclear spin-polarized ³He gas has been widely used in neutron scattering experiments. Spin-exchange optical pumping (SEOP) is one of the primary methods to produce polarized ³He. In SEOP, ³He is polarized via spin exchange collisions with optically pumped rubidium (Rb) atoms. At Indiana University, we have developed a boat system and a compact system based on the SEOP method to produce hyperpolarized ³He. A nuclear magnetic resonance (NMR) system has been built to monitor the relative ³He polarization as well as to flip the polarization. In order to get an absolute measure of the ³He polarization, an electron paramagnetic resonance (EPR) system has also been constructed. The NMR and EPR combined offer a robust ³He polarimetry to our SEOP systems. To get better performance, a new SEOP method called Hybrid SEOP is applied, which uses a rubidium/potassium (K) mixture instead of a pure Rb vapor. We have successfully achieved up to 69% ³He polarization with this method on our compact system. One important application of polarized ³He is used as neutron spin filters. We provided a neutron polarizer imbedded with a NMR-based neutron spin flipper for the HB-2A powder diffractometer at Oak Ridge National Laboratory, which make the HB-2A the first powder diffractometer in US capable of performing polarized studies.